Charles's law for a fixed amount of gas at constant pressure states that:
A$V \propto T^2$
B$V$ is independent of $T$
C$V \propto T$ (Kelvin)
D$V \propto 1/T$
Answer & Solution
Correct answer: C. $V \propto T$ (Kelvin)
Charles's law: at fixed $P$ and $n$, volume is directly proportional to absolute temperature ($T$ in Kelvin): $V/T = $ constant.
Double the Kelvin temperature, double the volume. The key subtlety is that $T$ must be in Kelvin, not Celsius — Charles's law fails badly if you use Celsius (a gas at $0°$C has nonzero volume).
Graphically, $V$ vs $T$ (Kelvin) is a straight line passing through the origin.
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